diff options
| -rw-r--r-- | Documentation/media/uapi/v4l/mmap.rst | 4 | ||||
| -rw-r--r-- | Documentation/media/uapi/v4l/userp.rst | 4 |
2 files changed, 4 insertions, 4 deletions
diff --git a/Documentation/media/uapi/v4l/mmap.rst b/Documentation/media/uapi/v4l/mmap.rst index 2171b18c1aab..f7fe26e7ca43 100644 --- a/Documentation/media/uapi/v4l/mmap.rst +++ b/Documentation/media/uapi/v4l/mmap.rst @@ -11,8 +11,8 @@ Input and output devices support this I/O method when the :ref:`v4l2_capability <v4l2-capability>` returned by the :ref:`VIDIOC_QUERYCAP` ioctl is set. There are two streaming methods, to determine if the memory mapping flavor is -supported applications must call the -:ref:`VIDIOC_REQBUFS` ioctl. +supported applications must call the :ref:`VIDIOC_REQBUFS` ioctl +with the memory type set to ``V4L2_MEMORY_MMAP``. Streaming is an I/O method where only pointers to buffers are exchanged between application and driver, the data itself is not copied. Memory diff --git a/Documentation/media/uapi/v4l/userp.rst b/Documentation/media/uapi/v4l/userp.rst index 0ecf7a13a7af..2f0002bfbc3f 100644 --- a/Documentation/media/uapi/v4l/userp.rst +++ b/Documentation/media/uapi/v4l/userp.rst @@ -11,8 +11,8 @@ Input and output devices support this I/O method when the :ref:`v4l2_capability <v4l2-capability>` returned by the :ref:`VIDIOC_QUERYCAP` ioctl is set. If the particular user pointer method (not only memory mapping) is supported -must be determined by calling the -:ref:`VIDIOC_REQBUFS` ioctl. +must be determined by calling the :ref:`VIDIOC_REQBUFS` ioctl +with the memory type set to ``V4L2_MEMORY_USERPTR``. This I/O method combines advantages of the read/write and memory mapping methods. Buffers (planes) are allocated by the application itself, and |